baxter



(No Modell) 2 Sheets-Sheet 2.

W. C. BAXTER.

HOISTING APPARATUS.

No. 584,301. Patented June 8, 1897.

MrTn STATES PATENT Trice.

IVILLIAM C. BAXTER, OF EAST BRIDGEWATER, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO FREDERICK C. MANN, OF SAME PLACE.

HOISTING APPARATUS.

SPECIFICATION forming part of Letters Patent N o. 584,301, dated J une 8, 1897. Application filed October 2l, 1896. Serial No. 609,604. (No model.)

To aZZ whom it may concern/.-

Be it known that I, WILLIAM C. BAXTER, of East Bridgewater, in the county of Plymouth and State of Massachusetts, have invented a 5 new and useful Improvement in Hoisting Apparatus, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to a device to be used Io in connection with a hoisting apparatus; and it consists in a mechanism which will act both as a clutch and as a friction-stop, the object being to provide a simple device by which the hoistingdrum may be operated or held in check at any position. This object I attain by the mechanism shown in the accompanying drawings, in Which- Figure l is an elevation showing one of my hoisting-machines complete. Fig. 2 is a verzo tical longitudinal section showing the construction of the clutch and friction device.

Fig. 3 shows the same parts partly in section and partly in elevation. Fig. 4 is a cross-section taken on line ce .Goof Figs. l and 3.

In the drawings, A A B B represent the frame of the machine. The main or hoisting shaft Chas a rope wheel or drum P, about which the hoisting rope or chain works.

C is a spur-gear by means of which the 3o hoisting-Wheel P is made to rotate.

D is a pinion-gear engaging with the spurgear C and made to rotate by the shaft D, which in turn'is made to rotate by means of the rope-wheel D4.

3 5 My invention is embodied in that part of the machine that serves to connect the shaft D with the pinion-gear D', and may be described as follows: The shaft D passes through a iiXed sleeve E E, the said sleeve being fas- 4o tened to the frame by the bolts A2 A2. (See Fig. l.) A screw-thread E2 is cut upon one end of the sleeve, as shown in Fig. 2, upon which the nut E6 is secured. The pinion D is journaled upon the sleeve E E and has attached to it a crown-cam piece D2. (See Figs. 2, 3, and et.) The crown-cam piece D2is firmly attached to the pinion D', but both are loose on the sleeve E E. A second crowncam H is mounted loosely upon the sleeve E E. The two crown-cam pieces D2 and H form between them an annular groove of varying width, as shown in Fig. 3. In this groove I place a number of coned rollers L L L. The number of rollers may be varied to suit the size and other conditions of the device. The widths of the groove between the faces of the crowncams should be sufficient in the widest places R R to allow of perfect freedom of motion of the coned rollers L; but in their narrowest places T T there is not room for the rollers, 6o and any tendency of the rollers L L to move from the wide to the narrow places will tend to force the crown-cam pieces apart, and as the said pieces are held from spreading by the collars E4 and it is obvious that the 65 effort to spread or push apart the crown-cams D2 and H' will cause a friction to be brought onto the inner faces at the fixed ends (in this case the washers E4 and E5) of the fixed sleeve E E (see Figs. 2 and 3) and thus resist the 7o rotation of the pinion D', which is attached to the crown-cam D2.

The coned rollers L are held relatively in place by the rings K and K and by the pins or axles L L. The rings K and K" and the axles 7 5 L' L form a spider,7 which is free to move around the sleeve E.

The crown-cams D2 and H are provided with lugs, respectively, D3 D3 Dand H2 H2 H2, which lugs may engage with shoulders M2 M2 8o M2, formed in recesses M M made in the hood M. (See Figs. 3 and et.) The hood M is made fast to the shaft D by means of the key M4 and set-screw M5 in the hub M2.

As the recesses M Ml M in the hood M are considerably wider than the lugs D2 or H2, it is evident that the two crown-cams D2 and H may have a small relative motion about their common axes, but it is also evident that any such relative motion will at once cause a clos- 9o ing together of the walls of the groove between the crown-cams, so that the rollers L L will by reaction force their connected parts hard against the fixed washers E4 and E5, thus preventing the pinion D from rotating and through it and the spur-gear C and shaft C hold the hoisting drum or wheel P in place.

The arrangement of the crown-cams and their lugs D3 D2 and H2 H2 are such that when the lugs D3 and H2 are in line--that is, resting roo against the shoulders M2 of the hood-then there willbeno'strain to force the crown-can1s apart and there will be no friction on the iiXed washers E4 E5, so that the pinion D' and the other parts can freely rotate.

The working of the device is as follows: A

load placed' on the wheel vP will givernotionV to the pinion D', and this will causethe croWncams -D2 to start to rotate, but as the crowncains H stand still the rollers L L will act as Wedges and force the cams apart, so as toy bring friction onto the parts of the sleeveE E', and thus stop the rotation of the apparatus and hold the load in suspension. Toraise the load, the operator has only to draw on a rope (not shown) attached to the wheel D4,

andthis `will cause the hood M to rotate and bring' one of the shoulders of the recesses M in contactwith the lugs ADSH2 and force them into line,.thus providing freespaces between the crown-'cams for the rollers and yremove the tendency to-cause friction, as has `been explained. VNow by acontinuedstrain on the rope-.wheel D4 the load on the WheelfP canibc raised. To Ilower the load, the-wheel D4 is turned-in the opposite direction, and as soon as the lugsDs H2 are `brought into line the friction on the parts of'thc'slceve vE'E is rc- Inoved. It follows from thefmanner in which the groove between the crown-cams is formed Ywhich the said cams are journaled and having parts against which the said cams may exert friction, whenforced apart by said rollers, an operating-shaft passing through said sleeveand provided with a hood having recesses adapted to loosely engage with the above-mentioned lugsonrthe saidcrown-cains and to control their'niotion sothat thefsaid rollers between-them may or may notactto force them apart and ythus check'the .motion of the apparatus,substantially as andfor the `purpose-'set forth.

In. testimony whereof -I have signed-any name to this specification, in the prescnceof tWosu-bscribing witnesses, on this -l'th'day of October, A. D. 1890.

lWILLIAM .C. BAXTER. Vitnesses FRANK `Gr. PARKER, FRANK G. HATTIE. 

